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What command means “do nothing” in a conditional in Bash?
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The no-op command in shell is : (colon).
if [ "$a" -ge 10 ]
then
:
elif [ "$a" -le 5 ]
then
echo "1"
else
echo "2"
fi
From the bash manual:
: (a colon)
Do nothing beyond expanding arguments and performing redirections....
How to install a node.js module without using npm?
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You need to download their source from the github. Find the main file and then include it in your main file.
An example of this can be found here > How to manually install a node.js module?
Usually you need to find the source and go through the package.json file. There you can find which i...
What Are the Differences Between PSR-0 and PSR-4?
Recently I've read about namespaces and how they are beneficial. I'm currently creating a project in Laravel and trying to move from class map autoloading to namespacing. However, I can't seem to grasp what the actual difference is between PSR-0 and PSR-4.
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Versioning SQL Server database
....html. I choose not to put schema dumps in under version control as alumb and others suggest because I want an easy way to upgrade my production database.
For a web application where I'll have a single production database instance, I use two techniques:
Database Upgrade Scripts
A sequence databa...
Pure JavaScript Graphviz equivalent [closed]
...y embed Graphviz into my Node server as an extension, or even popen() it and stream over graph information in the .dot format.
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Remove Last Comma from a string
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This will remove the last comma and any whitespace after it:
str = str.replace(/,\s*$/, "");
It uses a regular expression:
The / mark the beginning and end of the regular expression
The , matches the comma
The \s means whitespace characters (space, tab...
Pro JavaScript programmer interview questions (with answers) [closed]
...ncredible complexity, you should be able to ask relatively basic questions and find out if they are really that good based on their answers. For instance, my standard first question to gauge the rest of the interview is:
In JavaScript, what is the difference between var x = 1 and x = 1? Answer...
Best way to randomize an array with .NET
What is the best way to randomize an array of strings with .NET? My array contains about 500 strings and I'd like to create a new Array with the same strings but in a random order.
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Legality of COW std::string implementation in C++11
It had been my understanding that copy-on-write is not a viable way to implement a conforming std::string in C++11, but when it came up in discussion recently I found myself unable to directly support that statement.
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Simple (non-secure) hash function for JavaScript? [duplicate]
... can simply call .hashCode() on any string, e.g. "some string".hashCode(), and receive a numerical hash code (more specifically, a Java equivalent) such as 1395333309.
String.prototype.hashCode = function() {
var hash = 0;
if (this.length == 0) {
return hash;
}
for (var i =...